Why the LED the in the dark? There are three reasons - China lighting network

Leds more with more dark, is a very common phenomenon. The reasons for the LED to be able to be darkened, nothing more than the following three points. Drive damage LED lamp bead requirements in dc low voltage ( Below 20 v) Work, but we usually mains is ac high voltage ( Ac 220 v) 。 Make grid lamp bead need electricity, will need a device that is called 'the LED constant current drive power'. In theory, as long as the parameters of the drive match the lamp bead board, can continue to power supply and normal use. Internal drive is more complex, any device ( Such as capacitors, rectifiers, etc. ) Fails, may cause the change of output voltage, resulting in the lamps and lanterns. Drive damage is one of the most common faults in the LED lamps and lanterns, usually after replacement drive can be solved. LED burned LED itself is made up of one lamp bead, if one of the part or not bright, is bound to make the whole lamps and lanterns is dark. Lights are generally first series and parallel - — So one lamp bead burned, it may lead to a group of lights are not lit up. After burning lamp bead surface has obvious black dot, find it, with a wire in the back of it, will it short circuit; Or replace a new lamp bead, can solve the problem. The LED burned a once in a while, may be happened. If often burned, the drive to consider - — Another manifestation of drive failure, it is burning lamp bead. LED light failure so-called droop, it is the brightness of the light is more and more low - — This kind of situation more obvious on the incandescent lamp and fluorescent lamp. Leds can avoid droop, but it droop speed is relatively slow, generally it is hard to see with the naked eye. But does not rule out bad LED, or bad bead light board, or due to poor heat dissipation and other objective factors, lead to the LED light failure speed is faster.

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